全文获取类型
收费全文 | 349篇 |
免费 | 16篇 |
国内免费 | 3篇 |
专业分类
电工技术 | 6篇 |
化学工业 | 78篇 |
金属工艺 | 4篇 |
机械仪表 | 11篇 |
建筑科学 | 8篇 |
矿业工程 | 5篇 |
能源动力 | 14篇 |
轻工业 | 22篇 |
水利工程 | 6篇 |
石油天然气 | 1篇 |
无线电 | 51篇 |
一般工业技术 | 71篇 |
冶金工业 | 16篇 |
原子能技术 | 2篇 |
自动化技术 | 73篇 |
出版年
2023年 | 7篇 |
2022年 | 15篇 |
2021年 | 19篇 |
2020年 | 18篇 |
2019年 | 17篇 |
2018年 | 26篇 |
2017年 | 15篇 |
2016年 | 23篇 |
2015年 | 8篇 |
2014年 | 30篇 |
2013年 | 33篇 |
2012年 | 22篇 |
2011年 | 13篇 |
2010年 | 23篇 |
2009年 | 15篇 |
2008年 | 15篇 |
2007年 | 13篇 |
2006年 | 5篇 |
2005年 | 3篇 |
2004年 | 2篇 |
2003年 | 4篇 |
2002年 | 2篇 |
2001年 | 4篇 |
2000年 | 5篇 |
1998年 | 5篇 |
1997年 | 6篇 |
1996年 | 2篇 |
1995年 | 3篇 |
1994年 | 1篇 |
1992年 | 2篇 |
1991年 | 2篇 |
1989年 | 1篇 |
1988年 | 1篇 |
1987年 | 3篇 |
1985年 | 1篇 |
1983年 | 3篇 |
1982年 | 1篇 |
排序方式: 共有368条查询结果,搜索用时 26 毫秒
1.
R. Jayasree T.S. Sampath Kumar Govindaraj Perumal Mukesh Doble 《Ceramics International》2018,44(8):9227-9235
Calcium phosphate cements (CPCs) are ideally suited for the local delivery of antibiotics in infected bone defects as they have multiple binding sites for loading various drugs. CPCs can also be substituted with ions such as Ag+, Zn2+, Mg2+, Sr2+, etc., to exhibit extended broad-spectrum antimicrobial activity. Strontium (Sr) in particular is known to enhance the new bone formation and decrease bone resorption. The current work aims to develop a dual action tetracalcium phosphate (TTCP) based cement which releases both the Sr2+ ion and ornidazole antibiotic drug for the treatment of bone infections. The TTCP with Sr2+ ion substitution was prepared by the solid state reaction method and it was used to form ornidazole loaded CPC. The ornidazole loaded cement prepared using 8?at% Sr substituted TTCP (8SCPC-O) showed complete hydroxyapatite (HA) formation in phosphate buffered solution at the end of 1 week. Fine needle-shaped HA crystals were observed in 8SCPC-O cement. In vitro drug release studies showed an accelerated ornidazole release from the 8SCPC-O sample when compared to samples without Sr substitution. Ornidazole releasing cements were found to be biocompatible with skeletal myoblast (L6) cells. Antibacterial activity of ornidazole releasing cement was evident from day 1 onwards against E. coli. The above results suggest 8SCPC-O as a good candidate for treating local bone infections. 相似文献
2.
Chandel Narendra Singh Chakraborty Subir Kumar Rajwade Yogesh Anand Dubey Kumkum Tiwari Mukesh K. Jat Dilip 《Neural computing & applications》2021,33(10):5353-5367
Neural Computing and Applications - The identification of water stress is a major challenge for timely and effective irrigation to ensure global food security and sustainable agriculture. Several... 相似文献
3.
Mukesh Kumar Harmanjit Singh Dosanjh Harminder Singh 《Journal of Inorganic and Organometallic Polymers and Materials》2018,28(5):1688-1705
Recently, magnetic bio-composites as adsorbent are widely being explored in waste water treatment because of their exceptional properties like high adsorption capacity, selectivity and cost-effective nature. In the present study, a novel recyclable magnetic composite containing magnetic zinc ferrite and alginate in alginic form (ZnFN–Alg) was developed. Various techniques like Fourier Transform-Infra Red, X-ray diffraction, transmission electron microscope with energy dispersive spectra, Brunauer–Emmett–Teller, thermo gravimetric-differential thermal analysis and Point Zero Charge (pHzpc) were used to characterize the surface morphology of magnetic composite. The magnetic composite was used as adsorbent to remove congo red, crystal violet and brilliant green dyes in single and ternary systems. The kinetic studies data was best fitted to Lagergren pseudo second order whereas mechanism of adsorption was described by intra particle diffusion model in single as well as ternary systems. The adsorption equilibrium data was best fitted to Langmuir isotherm among various adsorption isotherm models. Thermodynamic studies confirmed that the adsorption process was spontaneous in nature. The regeneration ability of ZnFN–Alg composite was studied individually in single and ternary dye systems for seven cycles and showed significant results. It was concluded that magnetic ZnFN–Alg can serve as suitable alternative for the removal of dyes in single and ternary systems. 相似文献
4.
Dhiman Gaurav Soni Mukesh Pandey Hari Mohan Slowik Adam Kaur Harsimran 《Engineering with Computers》2021,37(4):3017-3035
Engineering with Computers - A novel hybrid many-objective evolutionary algorithm called Reference Vector Guided Evolutionary Algorithm based on hypervolume indicator (H-RVEA) is proposed in this... 相似文献
5.
Economic models of urban spatial patterns have largely ignored complexity as an attribute of urban systems. Complexity theorists
on the other hand have not made sufficiently serious and sustained attempts to verify empirically the relevance of complex
systems models for urban spatial patterns. This research bridges this gap by simulating the evolution of an urban employment
pattern as a self-organizing complex system and seeking its empirical validation. It estimates the model’s parameters by using
firm data aggregated to the level of municipalities in Cleveland-Akron Consolidated Metropolitan Statistical Area in Ohio.
The interaction among four parameters, forces of attraction and dispersion and their respective rates of dissipation with
distance, are modeled as a two-dimensional complex system. The research compares the states of the modeled system with empirical
data to present viable methods for verification, calibration and validation of such models.
相似文献
6.
7.
Ms. Mukesh Dalal Dr. Mamta Juneja 《Information Security Journal: A Global Perspective》2020,29(1):40-50
ABSTRACTIn recent years, information security over the internet has gained enormous immersion due to a technological escalation in communication via digital media. Nowadays, videos are the most common form of media over the internet, and they have gained the attention of video steganography research community for the security of the communication. This paper implemented video steganography using a widely-known transform technique, discrete wavelet transform (DWT) which consists of different orthogonal and biorthogonal filters used for the decomposition of a frame/image. The aim of this paper is to provide a comparative evaluation for orthogonal and biorthogonal DWT filters with different matrices such as MSE, PSNR. The performance of the different filters has been evaluated both quantitatively and qualitatively to investigate the best among them. Also, the best of orthogonal and biorthogonal filters have been further evaluated with other metrics such as SSIM, BER and histogram analysis. Further, the embedding algorithm has been compared with the existing video steganography techniques. The experimental results illustrate that bior 6.8 (biorthogonal filter) outperforms the other orthogonal and biorthogonal filters in terms of visual distortion. 相似文献
8.
9.
Ashwani Kumar Tiwari Prasoon Kumar Singh Mukesh Kumar Mahato 《Mine Water and the Environment》2017,36(4):532-541
This study was carried out in the West Bokaro coalfield area of the Jharkhand state of India to assess water quality for drinking and domestic purposes. Thirty mine water samples were collected from opencast and underground mines, and concentrations of Al, As, Ba, Cr, Cu, Fe, Mn, Ni, Se, and Zn were determined using ICP-MS. Spatial distribution maps were prepared using GIS software so that the quality of the mine water could be easily understood. Metal concentrations were higher in the pre-monsoon season than in the post-monsoon season, irrespective of location, but there were more significant seasonal variations in the opencast mine water than in the underground mine water. The concentrations of Al, Ba, Fe, Mn, and Ni exceeded the desirable as well as the permissible drinking water limits in both seasons. The quality of the surface water as well as the groundwater in the region may be adversely affected by the high metal concentrations in this mine water. 相似文献
10.
Fabrication and Circuit Modeling of NMOS Inverter Based
on Quantum Dot Gate Field-Effect Transistors
Supriya Karmakar John A. Chandy Mukesh Gogna Faquir C. Jain 《Journal of Electronic Materials》2012,41(8):2184-2192
This paper presents the fabrication of a negative-channel metal–oxide–semiconductor (NMOS) inverter based on quantum dot gate field-effect transistors (QDG-FETs). A QDG-FET produces one intermediate state in its transfer characteristic. NMOS inverters based on a QDG-FET produce three states in their transfer characteristic. The generation of the third state in the inverter characteristic makes this a promising circuit element for multivalued logic implementation. A circuit simulation result based on the Berkley simulation (BSIM) circuit model of the QDG-FET is also presented in this paper, predicting the fabricated device characteristic. 相似文献